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- Q6036761 subject Q8529928.
- Q6036761 subject Q8529929.
- Q6036761 abstract "In the original S/360 and S/370 architectures, each processor had its own set of I/O channels and addressed I/O devices with a 12-bit cuu address, containing a 4-bit channel number and an 8-bit unit (device) number to be sent on the channel bus in order to select the device; the operating system had to be configured to reflect the processor and cuu address for each device. The operating system had logic to queue pending I/O on each channel and to handle selection of alternate channels. Initiating an I/O to a channel on a different processor required causing a shoulder tap interrupt on the other processor so that it could initiate the I/O.Starting with the IBM 3081 and IBM 4381 in S/370-Extended Architecture mode, IBM changed the I/O architecture to allow the Channel Subsystem to handle the channel scheduling that the operating system had to handle in S/370 mode. The new I/O architecture used a 16-bit Channel Path Id (CHPID); the Channel Subsystem was responsible for mapping the CHPID to the channel and device numbers, for queuing I/O requests and for selecting from the available paths. The installation was responsible for defining the Input/Output Configuration Data Sets (IOCDS's), and the operator could select a specific IOCDS as part of a power on reset (POR). Input/Output Configuration Program (IOCP) is a program for IBM mainframes that compiles a description of the Channel Subsystem and LPAR configuration, optionally loading it into an Input/Output Configuration Data Set (IOCDS); it recognizes the syntax of MVS Configuration Program (MVSCP) input, and there is no need to maintain separate input files.The direct use of IOCP and MVSCP has been mostly supplanted by Hardware Configuration Definition (HCD).".
- Q6036761 computingPlatform Q1586139.
- Q6036761 wikiPageExternalLink CCONTENTS.
- Q6036761 wikiPageExternalLink CCONTENTS.
- Q6036761 wikiPageWikiLink Q11223801.
- Q6036761 wikiPageWikiLink Q1586139.
- Q6036761 wikiPageWikiLink Q16799505.
- Q6036761 wikiPageWikiLink Q5968621.
- Q6036761 wikiPageWikiLink Q609843.
- Q6036761 wikiPageWikiLink Q7236171.
- Q6036761 wikiPageWikiLink Q827024.
- Q6036761 wikiPageWikiLink Q8529928.
- Q6036761 wikiPageWikiLink Q8529929.
- Q6036761 name "Input/Output Configuration Program".
- Q6036761 platform Q1586139.
- Q6036761 type CreativeWork.
- Q6036761 type Software.
- Q6036761 type Work.
- Q6036761 type Thing.
- Q6036761 type Q386724.
- Q6036761 type Q7397.
- Q6036761 comment "In the original S/360 and S/370 architectures, each processor had its own set of I/O channels and addressed I/O devices with a 12-bit cuu address, containing a 4-bit channel number and an 8-bit unit (device) number to be sent on the channel bus in order to select the device; the operating system had to be configured to reflect the processor and cuu address for each device. The operating system had logic to queue pending I/O on each channel and to handle selection of alternate channels.".
- Q6036761 label "Input/Output Configuration Program".
- Q6036761 name "Input/Output Configuration Program".